Salem t



(No Model.)

S. T. LAMB.

BURGLAR ALARM.

Patented Aug. 9

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UNITED STATES PATENT GFFICE.

SALEM T. LAMB, O F NEW ALBANY, INDIANA, ASSIGNOR OF THREE-FOURTHS TO'ARLANDO 'IHARRELL AND HARRY C. PARKER, BOTH OF SAME PLACE.

summa-ALARM.

SPECIFICATION forming part of Letters Patent No. 368,095, dated August 9, 1887.

Application filed February 23, 1887. Serial No` 228,638, (No model.)

-' zen of the United States, and aresident of New Albany, Floyd county, State of Indiana, have invented certain new and useful Improvements in BurglarAlarms, of-wlxich the following is a specification.

rIhis invention relates to that class of burglaralarms in which an audible alarm is produced by the contact of parts or the ignition of an explosive matter; and it consists in the peculiar construction and arrangement of the various parts of the alarm, as hereinafter fully set forth, and pointed out in the claims.

In the drawings, Figure 1 is a perspective view showing the device applied to a window in such a manner as to be operated by raising the sash; Fig. 2, a view showing the device applied to a door, so as to be operated on opeuing the said door. Figs. 3 and4 arerear views ofthe device,illustrating the operation thereof. Fig. 5 is a perspective view of a detail, and Fig. 6 an eud view of the 4device in a closed position. Fig. 7 is aview illustrating the use of a movable contact on a door; Fig. 8, a modifcation.

`A and B are two plates or parts, which are hinged together by a pintle, C, extendingv through ears 2 and 3 on the plate A and ears 4 and 5 on the plate B, and securedto one or both ears of one of the plates, the ears projecting from the edges of the plates A and B, near the ends thereof, at right angles to the said edges and to the faces of the plates.

The plate A is provided with holes for the passage of screws, whereby it maybe secured to awindow-casing or door-frame, and pref crably carries a projecting stud, a, constituting a hammer, sharpened and fastened securely to or formed as part of the plate, and the plate B is provided with an. arm, 6, projecting laterally from the edge opposite that hinged to the plate A, and carrying a socketed projection, 7, adapted to receive a cap or cartridge. The stud a and the projection 7 are so placed that' they will come in contact when the plates 'are brought to the position shown in Fig. 6.

A coiled spring, I), surrounds the pintle or bolt C and bears against the ears 2 and 5, and

5o has one end secured to the plate A and the other 'end to the plate B in such amanner that the tendency of the spring is to retain the plates in their closed position, (shown in Fig. 6,) or to forcibly return the plate B to such position after it has been moved to the position shown in dotted lines in the said ligure. The

`ends of the spring are preferably secured as shown, being seated in short grooves 8 in the back of the plates and passing through holes or passages 9 in said plates at the termination of the said grooves.

Ou the contiguous faces of the ears 2 and 4 lof the plates A and B are spiral inclines l5 16,

the'said inclines terminating in shoulders l() 17, as shown in Figs. 3, 4, and 5, and the spring lD tends to force the said ears and inclines to` ward each other.

The faces of the shoulders are slightly bev eled or inclined, so that if sufficient force be applied to swing the plate B the said shoulders will move'one over the otherand the plate lprojections a 7, producinga sharp rap, or eX- ploding a cap, if one has been placed in the socket, thus giving an alarm.

Both the spiral and the longitudinal action of the spring areutilized, thelongitudinalaction tending to force the ears 2 4 together and preventing the shoulders from slipping over each other, and the spiral action closing the plate B toward the plate A as soon as the shoulders have escaped contact. slightly beveled, any excessive pressure tending to swing the plate B will cause one shoulder to ride over the other,and thus release the plate B.

The window-sash is provided with a pin,'l2, so arranged that when the plate B is locked in its open position and the sash is raised but a short distance the piu will engage with the rear side of the arm 6 and will turn said plate B ou its pintle until the shoulders escape contact, when the spring will carry the plates together in the manner before set forth.

The frame of the alarm projects out,so that a curtain, if used on the window, will be held As the shoulders are away from the cap or cartridge, and will thus be protected when the explosion takes place. In Fig. 2 the device is shown applied to a door-frame and the door provided with a con- 5 tact piece or plate, 13, to protect the edge, which will come in contact when opened with the arm 6 of the plate B. In some cases said contact-piece may be movable, so as to be turned into position to strike the movable 1o plate ofthe alarm, and the contact-piece may belocked in place to insure contact. This arrangementis desirable for the outer door of a house, so that after fastening the windows and other doors from the inside aparty can set the i5 alarm, close the outer door, and then by means ofa key or adjusting device turn the Contact piece into position to strike the alarm and lock it in place.

Fig. 7 shows one arrangement where a contact-piece, 13, is hinged in a case at zr', so as to be turned from the position shown in dotted lines to a position (shown in full lines) back of the movable plate of the alarm, the door having a keyhole at the opposite side. Fig. 7 z 5 also shows another contact-piece in the form of a bolt, 13, sliding in a lock-case, 2l, and moved by a key, as usual, any suitable arrangement of tumblers locking the bolt after it is thrown.

Fig. S shows the device applied to the lower sash of a window in such manner that the raising of said sash or the lowering of the up per sash will cause the alarm to operate.

Vitho'ut limiting myself to the precise construction and arrangement of parts shown, I

claim 1. A burglar-alarm consisting ofasecuringplate, a springactuated plate hinged to the securing-plate and movable laterally and longi- 40 tudinally,and engaging-shoulders on the plates to frictionally retain them in their open position, one of said plates holding a detonator and the other acting as a hammer to explode the same, substantially as described.

2. A burglar-alarm consisting ofa securingplate, a movable plate, ears with inclines and shoulders on said plates, a pintle passing through said ears and loosely securing the plates together, and a spring bearing against the ears and face of the movable plate to carry and move it on its pintle, one of said plates carrying a detonator and the other a hammer or contact-piece, substantially as set forth, for the purpose specified.

3. Aburglar-alarm consisting of aseeuring 55 plate provided at one side with ears and carrying a projection, a movable spring-actuated plate, likewise provided at one side with ears which alternate with the ears on the securingplate, a holder for a cap or cartridge carried by said spring-actuated plate, and a pintle passing through said ears and loosely connecting the plates together, the adjacent faces of the ears being inclined and provided with shoulders, substantially as and for the purpose described.

4. In a burglar-alarm, the combination of two plates provided on one side with ears al* ternately arranged, as shown, and respectively carrying a dctonator and a hammer, a pintle passing through the ears and loosely connecting the plates, and a coil-spring supported by the pintle and connected at its opposite ends tothe plates, the contiguous faces of one pair of ears being oppositely inclined and each 75 provided with a shoulder, substantially as and for the purpose described.

5. The combination, in a burglar-alarm, of two plates loosely hinged together, one of the plates acting as a haminerand the other carrying a detonator, an interposed spring connected to the plates and normally tending to forcibly swing them toward each ol'l1er,means, substantially as described, for locking the plates in their separated position, and a cons: tact-piece carried by a sash or other movable object in line with one of said plates, whereby upon the movement of said contact-piece the plates are released, substantially as and for the purpose described.

6. In a burglar-alarm, a plate carried by a sash and provided with a projecting ear to receive securing bolts or screws, in combination with a movable springactuated plate loosely hinged to the edge ofsaid first plate, and de- 95 vices, substantially as described, to retain the plates in open position, one ofthe plates acting as a hammer and the other supporting a de tonator, as set forth.

In testimony whereof I have signed my name ioo to this speci fication in the presence. of two subscribing witnesses.

SALEM T. LAMB.

Vitnesses:

GEO. B. CARDWILL, EvAN B. SroTsENBURG. 

